Gas turbine driven by exhaust gas from internal combustion engine and method of controlling the same

Abstract

A gas turbine driven by exhaust gas from an internal combustion engine has a plurality of guide vanes formed at a constant circumferential pitch at a nozzle portion through which the exhaust gas is directed from a chamber in a scroll casing into a space where an impeller is rotatably mounted. The ends of the guide vanes are connected to an annular member which prevent these ends from being distorted or deformed due to thermal expansion under heat.

What is claimed is: 
     
       1. A gas turbine driven by exhaust gas from an internal combustion engine, having a scroll means into which said exhaust gas from said internal combustion engine is introduced, said scroll means being adapted to direct said exhaust gas in the form of a spiral flow; and impeller rotatably mounted in a center of said scroll means and adapted to be driven by energy of said exhaust gas from the scroll means and to discharge the exhaust gas after driving said impeller, in a direction of a rotation axis thereof from a central region thereof; a nozzle means, formed at an inner peripheral edge of said scroll means to surround said impeller, for restricting an axial width of a flow passage therein through which said exhaust gas from said scroll means flows out towards said impeller, to a magnitude substantially corresponding to that of vanes on said impeller; and a plurality of guide vanes, each attached to one respective end thereof at a predetermined circumferential pitch to one portion of an inner wall of said scroll means defining said nozzle means and extending in a direction parallel to the axis of said impeller such that their extended ends are opposed to an other portion of an inner wall of said scroll means through a gap therebetween, said guide vanes being adapted to deflect and guide the flow of said exhaust from said scroll means towards said impeller; and thermal distortion prevention means for substantially preventing distortion of the extended ends of said guide vanes due to heat. 
     
     
       2. A gas turbine driven by exhaust gas from an internal combustion engine, according to claim 1, wherein said thermal distortion prevention means includes an annular member which connects the extended ends of said guide vanes.